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Two will do, the living room and kitchen share one, and it will be washed after each drag.
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There are three if there are conditions. There are only two of them.
You can buy an automatic kind of mop, the effect is good, and it will be OK to put it in after use. The dehydration effect is very good!
In general, a 110 toilet hole, two 75 floor drain holes, a 50 washing machine drain hole, and a 50 washbasin drain hole, depending on what you put in.
There must be a sewer pipe, but not necessarily an exhaust pipe! >>>More
A gas water heater is sufficient, and an electric water heater also tends to be installed in a bathroom. >>>More
This has to be discussed with the homeowner downstairs, preferably, there is no decoration downstairs, because it is necessary to open holes, re-hang molds, and arrange sewer pipes for reference.